Heinrich osteemann and chaeles la



UNITED STATES ATENT CFFICE.

HEINRICH OSTERMANN AND CHARLES LACROIX, OF GENEVA, S\VITZER- LAND, ASSIGNORS TO THE USINE GENEVOISE DE DEGROSSISSAGE DOR,

OF SAME PLACE.

METALLIC ALLOY.

SPECIFICATION forming part of Letters Patent No. 388,146, dated August 21, 1888.

Application tiled April 19, 1888. Serial No. 271,213.

To all whom, it may concern:

Be it known that we, HEINRICH OSTER- MANN, chemist, and CHARLES LACROIX, director of the Usine Genevoise de Degrossissage Dor, both residing at Geneva, in Switzerland, have invented a newand useful Metallic Alloy, of which the following is a specification.

Our invention consists of a new metallic alloy intended to be used in place of steel, especially in mauutacturiug such parts of Watches or chronometers which are liable to alter the good acting of the watch or chronometer when they get magnetized or oxidized, especially in manufacturing balancewheels and spiral springs for watch-escapements.

Our metallic alloy is composed ofgold, palladium, rhodium, copper, manganese, silver, and platine. Those metals are suitably combined together in the following proportions: gold, thirty to forty parts; palladium, thirty to forty parts; rhodium, 0.1 to 5 parts; cop per, ten to twenty parts; manganese, 0.1 to 5 (No sprcimensi parts; silver, 0.1 to 5 parts; and platinc, 0.1 to 5 parts.

Having thus described our invention, we claim-- 1. An alloy composed of gold, palladium, rhodium, copper, manganese, silver, and platine, for the purpose specified.

2. An alloy composed ol'thirty to forty parts of gold, thirty to forty parts of palladium, one-tenth of a part to five parts of rhodium, ten to twenty parts of copper, one-tenth of a part to five parts of manganese, one tenth of a part to live parts silver, and one-tenth of a part to live parts of platine, substantially as described, and for the purpose specified.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HEINRICH OS'FERMANN. CHARLES LACROIX. \Vil nesses:

LYELL T. ADAMS, E. IMERSOI-INEIDER. 

